Crank-shaft



(No Model.)

W. HARDWIGK.

CRANE SHAFT.

No. 465,699. Patented Dec. 22, 1891.

UNITED STATES 'PATENT OFFICE.

TILLIAM HARDVICK, OF ERIE, PENNSYLVANIA.

AC RAN K-SHAFT.

SPECIFICATION forming part of Letters Patent No. 465,699, dated December 22, 1891.

Application filed Tuly 25, 1891. Serial No. 400,689. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM I-IARDWICK, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Crank-Shafts; and I do hereby declare the following to be a full, clear, and exact description of the invent-ion, such as will enable others skilled in the art to which it appertains to make and use the same.-

This invention relates to crank-shafts; and it consists in improvements in the construction thereof, as will be hereinafter fully set forth, and pointed out in the claims.

The object of my invention is to provide new and improved means for attaching the counterweighted disks to the crank-arms of the crank-shaft of a steam-engine or other machine requiring such disks.

My invention is illustrated in the accompan ying drawings, as follows:

Figure 1 shows a crank-shaft and counterweighted disks in longitudinal section, as on the line 2 2 in Fig. 2, and having my improvements embodied therein. Fig. 2 shows the same device in transverse section on the line l 1 in Fig. 1. Fig. 3 is a like view to Fig. l, showing a modified construction.

The letters of reference designating the several parts will be referred to in proper connection in the following general description of the construction of my invention.

The crank-shaft consists of the shaft A, the crank-arms a, and wrist-pin a', and may be formed of such metal and by suoli means as may be desired. Commonly such crank-shafts are formed of wrought steel or iron or of caststeel and then finished, and the counterweighted disks are attached to the crank-arms in various ways.

B marks one form of counterweight-disks, and B a modified form of the same part. The difference between the two parts is that in one the counter-weight h is formed integral with the disk and in the other the weight ZJ is a separate piece secured to the disk. Then made in this modified manner, as shown in Fig. 3, with detachable weights b', the material of which the weight is composed may be a heavier metal than the disk-as, for example, the disk may be cast-iron and the weight may be lead--and weights of different size and heft maybe attached to suit the requirements. l In both forms of construction the disks are preferably made of cast-iron and have a peripheral rim or fiange which extends over and covers the crank-arms, and there is a central opening' c to receive the shaft A.

On the under side of the rim, opposite thel weight, there are'lugs h2 b2 to embrace the outer ends of the crankarms. Then thc counter-weights are formed integral with the disk, as at b in Fig. l, a recess b3 is formed in the weight just below the inner end of the crank-arm a, and a like recess a2 is formed in the said crank-arm in position to stand immediately contiguous to the recess h3 when the disk is in place on the shaft. Then the counter-weight is a separate part, as in Fig. 3, it is preferably formed with a recess b4, corresponding with the recess b3, and also with a like recess if on its under or outer side. The central opening c in the disk may be of the same size of the shaft A, as in Fig. l, or it may be larger, so as to fit upon a boss c3 around the shaft at the inner end of the arm a, as in Fig. 3. It is preferable that this central opening be round, as it is more cheaply made in that form, and, as it should be perfectly central, it is much easier to so form it when round than when of any other form. Then the disks are in place, they are secured to the crankarms ct by screws d d, and when the weights are separate pieces, as in Fig. 3, they are secured to the disks by screws d d. After the parts are all in place and thus secured Babbitt metal or other easily-melted metal is poured into the interspaces at the ends of the crank-arms, as seen at c and c and in the construction shown in Fig. 3 at c2. This firmly secures the disks tothe crank-shaft, (and to the weights b when they are used,) so there can be no lost motion, and as the Babbitt or other metal enters the recesses b3 and a2 and b5 the disks (and the weights when separate pieces) cannot be removed without heating the parts sufficiently to melt the Babbitt.

What I claim as new isl. In a crank-shaft, the combination, with the shaft A and crank-arms a, of counterweighted disks having peripheral Bauges with internal lugs b2 b2 for embracing the outer ends of the crank-arms and central openin gs c for receiving said shaft, and means IOO for securing said disks to the sides of said said shaft, and a metal fusible at a 10W `tem- 1o crank-arms. peratnre fitting said recesses.

2. In a crank-shaft, the combination, With In testimony whereof I affix my signature in the shaft A and crank-arms a, having recesses presence of two Witnesses. a et their inner ends, of counterweivhted r f T disks having lugs b2 b2 on the inside ofbtheir M' HARD Ich' peripheral flanges and recesses in their counter-weights opposite the recesses 0.2 on the crank-arms, and central openings e, fitting IVitnesse's:

JNO. K. HALLOCK, WM. P. HAYES. 

